Fig. 4.

Ratio of enzymatic C : N acquisition, calculated as the sum of the log-transformed activities of beta-glucosidase and cellobiohydrolase activity over the sum the log- transformed activities of N-acetyl-glucosaminidase and leucine aminopeptidase activity at different incubation temperatures. Full triangles represent the values for soil which was exposed to 9 years of warming (means ± SE, n = 3). Open circles represent the values for soil which had experienced the corresponding natural temperature conditions (means ± SE, n = 3).